#define _CRT_SECURE_NO_WARNINGS
#include<iostream>
#include<stdio.h>
using namespace std;
int main()
{
	for (int i = 0; i < 100; i++)
	{
		int square = i * i;
		if (square >= 1800 && square <= 1900)
		{
			cout << square - i << endl;
		}
	}
	return 0;
}